Extension-hanger for lamps.



No. 753,850., PATENTED MAR. s, 1904.

J. BYSTROM.

EXTENSION HANGER FOR LAMPS.

, APPLIOATION FILED OCT. 19, 1903.

N0 MODEL.

W11" W/W M m: uonms PETERS c0 Pactouma, wAsuiunmu o c Patented March 8,1904.

PATENT OFFICE. I

JOHN BYSTROM, OF CHICAGO, ILLINOIS.

EXTENSION-HANGER, FOR LAMPS.

SPECIFICATION fOrming part of Letters Patent No. 753,850, dated March 8,1904.

Application filed October 19, 1903. Serial No. 177,644. (No model.)

To all whom it may concern.-

Be it known that I, J OHN BYSTROM, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Extension-Hangers forLamps, of which the following is a specification.

This invention refers to that form of extension-hangers in which a(clocklspring is employed to sustain the weight of the lamp and itscontents. While the tension of such spring remains constant, the weightof the lamp varies from time to time, and as'a consequence when the lampis newly filled the spring is not sufli ciently strong to support it,and when the oil in the lamp is nearly exhausted the tension of thespring tends to raise the lamp from a lowered position. The necessityfor a locking means to hold the lamp in any desired position ismanifest, and it is desirable that this locking means act to preventeither an uninfended upward or downward movement of the amp.

One of the objects of this invention, therefore, is the production of aneasily-operated positive-locking device forv hangers of the charactermentioned.

A further object of the invention is the production of anextension-hanger embodying the improvements in detail hereinafterpointed out.

In the accompanying drawings, Figure 1 is a top plan view of a hangerembodying the features of my invention. Fig. 2 is a vertical centralsection through said hanger, taken on dotted line 2 2 of Fig. 1. Fig. 3is a fragmental view, partly in section, showing the locking device.Fig. 4 is a View of a modified form of lock.

In the construction of this hanger I provide a suspension-stem 1, havingat its upper end an integral suspending-loop 2 for suspending the hangerfrom a hook or other suitable support. The stem 1 has a slot 3 extendinglongitudinally therethrough and at its lower end is reduced in diameterto form the shoulder 4. Ahorizontal base-bar 5 has a central opening 6for receiving the lower end of the suspension-stem 1, and surroundingsaid opening is an annular boss 7 upon which the shoulder 4 disks.

of the stem 1 is adapted to rest. The stem 1 is held rigid with thebase-bar 5 by means of a nut 8, adapted to be placed upon thescrewthreaded portion of said stem. At the outer ends of the base-bar 5are integral brackets 9 and 10, in which brackets are journaled.

sheaves 11 and 12, respectively. Ears 13 and 14 are also formed integralwith the opposite ends of the base-bar 5, said ea'rs being perforated toprovide means, as the rivets 15, for the attachment of an ornamentalshield or cover 16 to theunder side of said base-bar. Adjacent to thebearing-bracket 10 the basebar 5 is provided with an integral boss 17,in which is formed the radial channel 18, the floor of said channelbeing inclined toward the center of the bracket. The top and rear sidesof the channel 18 are closed by means of an angleplate 19, secured tothe outer end of said boss by means of screws 20. v

A lamp-supporting yoke 21 is carriedby means of the chains 22 and 23,the inner ends of which chains are wound upon a drum 24, rotatablymounted upon the stem 1. These chains are Wound upon the drum 24 inopposite directions and extend to the yoke 21, passing over the sheaves11 and 12 and through openings 25 in the shell or casing 16. Stopballs26 are provided in said chains near the point of their attachment to theyoke 21, said balls being to limit the upward movement of said yoke. Thedrum 24 is formed of two disks 27 and 28, joined together by a periph--eral band 29, which band is provided with ears 30, adapted to extendthrough suitable openings in the disks 27 and 28 and to be turneddownward upon the outer faces of said 7 The disk 28 is provided in itsperiphery with notches 31 of dovetail outline, and both the disks 27 and28 are centrally perforated and turned inward in the ,annularbearingrings 32, by means of which bearingrings a great bearing-surfacefor said drum is provided. A clock-spring 33 is attached at its innerend to the stem 1 by passing through slot 3 therein, the outer end ofthe spring being secured to the drum 24 by means of the rivet 34, whichpasses through the two disks 27 and 28 of the drum and about which theouter end of the spring is wrapped.

Alooking-roller 35 is provided for the channel 18 in the boss 17 saidroller being free to move forward and backward in said channel. When inits forward position, the periphery of said roller extends within one ofthe dovetail notches 31 in the lower disk 28 of the drum 2 1 and whileit there remains locks said drum from rotation in either direction. Thefloor of the channel 18, within which the roller 35 is confined, slants,as hereinbefore stated, toward the center of the hanger, and by reasonof this the roller is normally thrown into engagement with the notches31. The roller 35 is provided with a rim 36 of dovetail cross-sectionand upon its periphery with an annular bearing-rib 37, upon which lattersaid roller runs. To withdraw the roller 35 from engagement with thenotched periphery of the disk 28, the yoke 21 is moved in the directionof the arrow 38 in the ball 26. This movement of the yoke rocks thebase-bar 5, so that the floor of the channel 18 is inclined away fromthe center of the hanger. If the drum 24 is now moved slightly byraising or lowering the lamp, the roller 35 will be freed fromengagement with the dovetail openings 31 in the periphery of the disk 28and permitted to roll back within its said channel 18. The lamp may nowhe raised or lowered at will, and when brought to rest in a normalposition the roller 35 returns to the forward part of the channel 18 toenter the dovetail openings 31, as before. From the constructionhereinbefore described it is manifest that the drum 24 is locked by theroller 35 from rotation in either direction. The stem 1 is maderemovable in order that the slot 3 may easily be milled therein.

In Fig. 4: I have illustrated amodified form of gravity-lock consistingof a pawl 39, pivotally supported upon a boss 40, extending from theside of the bracket 10, which bracket is formed integral with andextends upwardly from the base-bar 5. The pawl 39 is suspended in suchmanner as to normally swing into engagement with notches 31 in the lowerdisk 28. It is withdrawn from said notches by moving the yoke 21, ashereinbefore described. The walls of the channel 18 and the cover 19therefor form a housing for the roller 35.

It is clear that various changes may be made in the embodiment hereindescribed without departing from the spirit and scope of my invention.Therefore I desire not to limit myself to the precise details set forth.

I claim as my invention 1. In an extension-hanger for lamps, incombination, a drum rotatable in a horizontal plane, said drum having aperipheral notch in its lower side; a spring for said drum; asuspension-chain adapted to be wound upon said drum; and alocking-roller arranged to engage the notch in said drum for positivelylocking the drum from rotation in either direction.

2. In an extension-hanger for lamps, in combination, a drum rotatable ina horizontal plane, said drum having a dovetail peripheral notch initslower side; a spring for said drum; asuspension-chain arranged to bewound upon said drum; and alocking-roller havingadovetail peripheryarranged to engage the dovetail locking-notch in said drum.

3. In an extensionhanger for lamps, in combination, a base-bar; a drumrotatably Y mounted upon said base-bar, said drum being provided with alocking-notch in its lower side; a spring for said drum; asuspensionchain'arranged to be wound upon said drum; a housing supportedby said base-bar; and a locking-roller loosely supported in said housing and arranged to engage the notch in said 7 drum.

4. In an extension-hanger for lamps, in combination, a base-bar providedat its ends with integral bearing-brackets; sheaves journaled in saidbrackets; a drum rotatably supported upon said base-bar, said drum beingprovided in its lower side with a locking-notch suspension-chainsattached to said drum and extending over said sheaves; a spring for saiddrum; a housing supported by said base-bar; and a roller looselysupported in said housing and arranged to engage the notch in said drum.

5. In an extension-hanger for lamps, in combination, a base-bar providedat its ends with integral bearing-brackets; sheaves journaled in saidbrackets; a stem fixed to said base-bar and provided with asuspension-loop; a drum rotatably mounted upon said stem, said drumbeing provided with a lockingnotch; suspension-chains attached to saiddrum and extending over said sheaves; a spring for said drum; a housingsupported by said basebar; and a roller loosely supported in saidhousing and arranged to engage the notch in said drum.

JOHN BYSTROM. Witnesses:

L. L. MILLER, GEORGE L. CHINDAHL.

